827 lines
20 KiB
C
827 lines
20 KiB
C
/*
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* Kernel Debugger Architecture Independent Console I/O handler
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved.
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* Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/ctype.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/kdev_t.h>
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#include <linux/console.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/nmi.h>
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#include <linux/delay.h>
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#include <linux/kgdb.h>
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#include <linux/kdb.h>
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#include <linux/kallsyms.h>
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#include "kdb_private.h"
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#define CMD_BUFLEN 256
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char kdb_prompt_str[CMD_BUFLEN];
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int kdb_trap_printk;
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static void kgdb_transition_check(char *buffer)
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{
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int slen = strlen(buffer);
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if (strncmp(buffer, "$?#3f", slen) != 0 &&
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strncmp(buffer, "$qSupported#37", slen) != 0 &&
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strncmp(buffer, "+$qSupported#37", slen) != 0) {
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KDB_STATE_SET(KGDB_TRANS);
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kdb_printf("%s", buffer);
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}
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}
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static int kdb_read_get_key(char *buffer, size_t bufsize)
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{
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#define ESCAPE_UDELAY 1000
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#define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */
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char escape_data[5]; /* longest vt100 escape sequence is 4 bytes */
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char *ped = escape_data;
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int escape_delay = 0;
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get_char_func *f, *f_escape = NULL;
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int key;
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for (f = &kdb_poll_funcs[0]; ; ++f) {
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if (*f == NULL) {
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/* Reset NMI watchdog once per poll loop */
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touch_nmi_watchdog();
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f = &kdb_poll_funcs[0];
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}
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if (escape_delay == 2) {
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*ped = '\0';
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ped = escape_data;
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--escape_delay;
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}
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if (escape_delay == 1) {
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key = *ped++;
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if (!*ped)
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--escape_delay;
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break;
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}
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key = (*f)();
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if (key == -1) {
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if (escape_delay) {
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udelay(ESCAPE_UDELAY);
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--escape_delay;
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}
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continue;
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}
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if (bufsize <= 2) {
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if (key == '\r')
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key = '\n';
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*buffer++ = key;
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*buffer = '\0';
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return -1;
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}
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if (escape_delay == 0 && key == '\e') {
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escape_delay = ESCAPE_DELAY;
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ped = escape_data;
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f_escape = f;
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}
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if (escape_delay) {
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*ped++ = key;
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if (f_escape != f) {
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escape_delay = 2;
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continue;
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}
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if (ped - escape_data == 1) {
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/* \e */
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continue;
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} else if (ped - escape_data == 2) {
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/* \e<something> */
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if (key != '[')
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escape_delay = 2;
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continue;
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} else if (ped - escape_data == 3) {
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/* \e[<something> */
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int mapkey = 0;
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switch (key) {
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case 'A': /* \e[A, up arrow */
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mapkey = 16;
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break;
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case 'B': /* \e[B, down arrow */
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mapkey = 14;
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break;
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case 'C': /* \e[C, right arrow */
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mapkey = 6;
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break;
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case 'D': /* \e[D, left arrow */
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mapkey = 2;
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break;
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case '1': /* dropthrough */
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case '3': /* dropthrough */
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/* \e[<1,3,4>], may be home, del, end */
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case '4':
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mapkey = -1;
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break;
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}
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if (mapkey != -1) {
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if (mapkey > 0) {
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escape_data[0] = mapkey;
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escape_data[1] = '\0';
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}
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escape_delay = 2;
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}
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continue;
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} else if (ped - escape_data == 4) {
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/* \e[<1,3,4><something> */
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int mapkey = 0;
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if (key == '~') {
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switch (escape_data[2]) {
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case '1': /* \e[1~, home */
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mapkey = 1;
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break;
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case '3': /* \e[3~, del */
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mapkey = 4;
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break;
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case '4': /* \e[4~, end */
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mapkey = 5;
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break;
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}
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}
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if (mapkey > 0) {
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escape_data[0] = mapkey;
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escape_data[1] = '\0';
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}
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escape_delay = 2;
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continue;
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}
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}
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break; /* A key to process */
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}
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return key;
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}
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/*
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* kdb_read
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*
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* This function reads a string of characters, terminated by
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* a newline, or by reaching the end of the supplied buffer,
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* from the current kernel debugger console device.
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* Parameters:
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* buffer - Address of character buffer to receive input characters.
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* bufsize - size, in bytes, of the character buffer
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* Returns:
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* Returns a pointer to the buffer containing the received
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* character string. This string will be terminated by a
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* newline character.
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* Locking:
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* No locks are required to be held upon entry to this
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* function. It is not reentrant - it relies on the fact
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* that while kdb is running on only one "master debug" cpu.
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* Remarks:
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*
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* The buffer size must be >= 2. A buffer size of 2 means that the caller only
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* wants a single key.
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*
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* An escape key could be the start of a vt100 control sequence such as \e[D
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* (left arrow) or it could be a character in its own right. The standard
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* method for detecting the difference is to wait for 2 seconds to see if there
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* are any other characters. kdb is complicated by the lack of a timer service
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* (interrupts are off), by multiple input sources and by the need to sometimes
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* return after just one key. Escape sequence processing has to be done as
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* states in the polling loop.
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*/
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static char *kdb_read(char *buffer, size_t bufsize)
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{
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char *cp = buffer;
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char *bufend = buffer+bufsize-2; /* Reserve space for newline
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* and null byte */
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char *lastchar;
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char *p_tmp;
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char tmp;
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static char tmpbuffer[CMD_BUFLEN];
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int len = strlen(buffer);
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int len_tmp;
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int tab = 0;
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int count;
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int i;
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int diag, dtab_count;
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int key;
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diag = kdbgetintenv("DTABCOUNT", &dtab_count);
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if (diag)
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dtab_count = 30;
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if (len > 0) {
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cp += len;
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if (*(buffer+len-1) == '\n')
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cp--;
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}
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lastchar = cp;
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*cp = '\0';
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kdb_printf("%s", buffer);
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poll_again:
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key = kdb_read_get_key(buffer, bufsize);
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if (key == -1)
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return buffer;
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if (key != 9)
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tab = 0;
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switch (key) {
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case 8: /* backspace */
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if (cp > buffer) {
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if (cp < lastchar) {
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memcpy(tmpbuffer, cp, lastchar - cp);
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memcpy(cp-1, tmpbuffer, lastchar - cp);
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}
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*(--lastchar) = '\0';
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--cp;
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kdb_printf("\b%s \r", cp);
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tmp = *cp;
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*cp = '\0';
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kdb_printf(kdb_prompt_str);
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kdb_printf("%s", buffer);
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*cp = tmp;
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}
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break;
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case 13: /* enter */
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*lastchar++ = '\n';
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*lastchar++ = '\0';
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kdb_printf("\n");
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return buffer;
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case 4: /* Del */
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if (cp < lastchar) {
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memcpy(tmpbuffer, cp+1, lastchar - cp - 1);
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memcpy(cp, tmpbuffer, lastchar - cp - 1);
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*(--lastchar) = '\0';
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kdb_printf("%s \r", cp);
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tmp = *cp;
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*cp = '\0';
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kdb_printf(kdb_prompt_str);
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kdb_printf("%s", buffer);
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*cp = tmp;
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}
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break;
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case 1: /* Home */
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if (cp > buffer) {
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kdb_printf("\r");
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kdb_printf(kdb_prompt_str);
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cp = buffer;
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}
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break;
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case 5: /* End */
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if (cp < lastchar) {
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kdb_printf("%s", cp);
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cp = lastchar;
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}
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break;
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case 2: /* Left */
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if (cp > buffer) {
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kdb_printf("\b");
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--cp;
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}
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break;
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case 14: /* Down */
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memset(tmpbuffer, ' ',
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strlen(kdb_prompt_str) + (lastchar-buffer));
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*(tmpbuffer+strlen(kdb_prompt_str) +
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(lastchar-buffer)) = '\0';
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kdb_printf("\r%s\r", tmpbuffer);
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*lastchar = (char)key;
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*(lastchar+1) = '\0';
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return lastchar;
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case 6: /* Right */
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if (cp < lastchar) {
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kdb_printf("%c", *cp);
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++cp;
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}
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break;
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case 16: /* Up */
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memset(tmpbuffer, ' ',
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strlen(kdb_prompt_str) + (lastchar-buffer));
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*(tmpbuffer+strlen(kdb_prompt_str) +
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(lastchar-buffer)) = '\0';
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kdb_printf("\r%s\r", tmpbuffer);
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*lastchar = (char)key;
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*(lastchar+1) = '\0';
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return lastchar;
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case 9: /* Tab */
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if (tab < 2)
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++tab;
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p_tmp = buffer;
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while (*p_tmp == ' ')
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p_tmp++;
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if (p_tmp > cp)
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break;
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memcpy(tmpbuffer, p_tmp, cp-p_tmp);
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*(tmpbuffer + (cp-p_tmp)) = '\0';
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p_tmp = strrchr(tmpbuffer, ' ');
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if (p_tmp)
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++p_tmp;
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else
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p_tmp = tmpbuffer;
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len = strlen(p_tmp);
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count = kallsyms_symbol_complete(p_tmp,
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sizeof(tmpbuffer) -
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(p_tmp - tmpbuffer));
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if (tab == 2 && count > 0) {
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kdb_printf("\n%d symbols are found.", count);
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if (count > dtab_count) {
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count = dtab_count;
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kdb_printf(" But only first %d symbols will"
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" be printed.\nYou can change the"
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" environment variable DTABCOUNT.",
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count);
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}
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kdb_printf("\n");
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for (i = 0; i < count; i++) {
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if (kallsyms_symbol_next(p_tmp, i) < 0)
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break;
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kdb_printf("%s ", p_tmp);
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*(p_tmp + len) = '\0';
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}
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if (i >= dtab_count)
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kdb_printf("...");
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kdb_printf("\n");
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kdb_printf(kdb_prompt_str);
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kdb_printf("%s", buffer);
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} else if (tab != 2 && count > 0) {
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len_tmp = strlen(p_tmp);
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strncpy(p_tmp+len_tmp, cp, lastchar-cp+1);
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len_tmp = strlen(p_tmp);
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strncpy(cp, p_tmp+len, len_tmp-len + 1);
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len = len_tmp - len;
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kdb_printf("%s", cp);
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cp += len;
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lastchar += len;
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}
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kdb_nextline = 1; /* reset output line number */
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break;
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default:
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if (key >= 32 && lastchar < bufend) {
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if (cp < lastchar) {
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memcpy(tmpbuffer, cp, lastchar - cp);
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memcpy(cp+1, tmpbuffer, lastchar - cp);
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*++lastchar = '\0';
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*cp = key;
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kdb_printf("%s\r", cp);
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++cp;
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tmp = *cp;
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*cp = '\0';
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kdb_printf(kdb_prompt_str);
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kdb_printf("%s", buffer);
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*cp = tmp;
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} else {
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*++lastchar = '\0';
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*cp++ = key;
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/* The kgdb transition check will hide
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* printed characters if we think that
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* kgdb is connecting, until the check
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* fails */
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if (!KDB_STATE(KGDB_TRANS))
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kgdb_transition_check(buffer);
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else
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kdb_printf("%c", key);
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}
|
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/* Special escape to kgdb */
|
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if (lastchar - buffer >= 5 &&
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strcmp(lastchar - 5, "$?#3f") == 0) {
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strcpy(buffer, "kgdb");
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KDB_STATE_SET(DOING_KGDB);
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return buffer;
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}
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if (lastchar - buffer >= 14 &&
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strcmp(lastchar - 14, "$qSupported#37") == 0) {
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strcpy(buffer, "kgdb");
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KDB_STATE_SET(DOING_KGDB2);
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return buffer;
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}
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}
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break;
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}
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goto poll_again;
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}
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|
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/*
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* kdb_getstr
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*
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* Print the prompt string and read a command from the
|
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* input device.
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*
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* Parameters:
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* buffer Address of buffer to receive command
|
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* bufsize Size of buffer in bytes
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* prompt Pointer to string to use as prompt string
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* Returns:
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* Pointer to command buffer.
|
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* Locking:
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* None.
|
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* Remarks:
|
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* For SMP kernels, the processor number will be
|
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* substituted for %d, %x or %o in the prompt.
|
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*/
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char *kdb_getstr(char *buffer, size_t bufsize, char *prompt)
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{
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if (prompt && kdb_prompt_str != prompt)
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strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
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kdb_printf(kdb_prompt_str);
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kdb_nextline = 1; /* Prompt and input resets line number */
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return kdb_read(buffer, bufsize);
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}
|
|
|
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/*
|
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* kdb_input_flush
|
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*
|
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* Get rid of any buffered console input.
|
|
*
|
|
* Parameters:
|
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* none
|
|
* Returns:
|
|
* nothing
|
|
* Locking:
|
|
* none
|
|
* Remarks:
|
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* Call this function whenever you want to flush input. If there is any
|
|
* outstanding input, it ignores all characters until there has been no
|
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* data for approximately 1ms.
|
|
*/
|
|
|
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static void kdb_input_flush(void)
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{
|
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get_char_func *f;
|
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int res;
|
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int flush_delay = 1;
|
|
while (flush_delay) {
|
|
flush_delay--;
|
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empty:
|
|
touch_nmi_watchdog();
|
|
for (f = &kdb_poll_funcs[0]; *f; ++f) {
|
|
res = (*f)();
|
|
if (res != -1) {
|
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flush_delay = 1;
|
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goto empty;
|
|
}
|
|
}
|
|
if (flush_delay)
|
|
mdelay(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* kdb_printf
|
|
*
|
|
* Print a string to the output device(s).
|
|
*
|
|
* Parameters:
|
|
* printf-like format and optional args.
|
|
* Returns:
|
|
* 0
|
|
* Locking:
|
|
* None.
|
|
* Remarks:
|
|
* use 'kdbcons->write()' to avoid polluting 'log_buf' with
|
|
* kdb output.
|
|
*
|
|
* If the user is doing a cmd args | grep srch
|
|
* then kdb_grepping_flag is set.
|
|
* In that case we need to accumulate full lines (ending in \n) before
|
|
* searching for the pattern.
|
|
*/
|
|
|
|
static char kdb_buffer[256]; /* A bit too big to go on stack */
|
|
static char *next_avail = kdb_buffer;
|
|
static int size_avail;
|
|
static int suspend_grep;
|
|
|
|
/*
|
|
* search arg1 to see if it contains arg2
|
|
* (kdmain.c provides flags for ^pat and pat$)
|
|
*
|
|
* return 1 for found, 0 for not found
|
|
*/
|
|
static int kdb_search_string(char *searched, char *searchfor)
|
|
{
|
|
char firstchar, *cp;
|
|
int len1, len2;
|
|
|
|
/* not counting the newline at the end of "searched" */
|
|
len1 = strlen(searched)-1;
|
|
len2 = strlen(searchfor);
|
|
if (len1 < len2)
|
|
return 0;
|
|
if (kdb_grep_leading && kdb_grep_trailing && len1 != len2)
|
|
return 0;
|
|
if (kdb_grep_leading) {
|
|
if (!strncmp(searched, searchfor, len2))
|
|
return 1;
|
|
} else if (kdb_grep_trailing) {
|
|
if (!strncmp(searched+len1-len2, searchfor, len2))
|
|
return 1;
|
|
} else {
|
|
firstchar = *searchfor;
|
|
cp = searched;
|
|
while ((cp = strchr(cp, firstchar))) {
|
|
if (!strncmp(cp, searchfor, len2))
|
|
return 1;
|
|
cp++;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int vkdb_printf(const char *fmt, va_list ap)
|
|
{
|
|
int diag;
|
|
int linecount;
|
|
int logging, saved_loglevel = 0;
|
|
int saved_trap_printk;
|
|
int got_printf_lock = 0;
|
|
int retlen = 0;
|
|
int fnd, len;
|
|
char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
|
|
char *moreprompt = "more> ";
|
|
struct console *c = console_drivers;
|
|
static DEFINE_SPINLOCK(kdb_printf_lock);
|
|
unsigned long uninitialized_var(flags);
|
|
|
|
preempt_disable();
|
|
saved_trap_printk = kdb_trap_printk;
|
|
kdb_trap_printk = 0;
|
|
|
|
/* Serialize kdb_printf if multiple cpus try to write at once.
|
|
* But if any cpu goes recursive in kdb, just print the output,
|
|
* even if it is interleaved with any other text.
|
|
*/
|
|
if (!KDB_STATE(PRINTF_LOCK)) {
|
|
KDB_STATE_SET(PRINTF_LOCK);
|
|
spin_lock_irqsave(&kdb_printf_lock, flags);
|
|
got_printf_lock = 1;
|
|
atomic_inc(&kdb_event);
|
|
} else {
|
|
__acquire(kdb_printf_lock);
|
|
}
|
|
|
|
diag = kdbgetintenv("LINES", &linecount);
|
|
if (diag || linecount <= 1)
|
|
linecount = 24;
|
|
|
|
diag = kdbgetintenv("LOGGING", &logging);
|
|
if (diag)
|
|
logging = 0;
|
|
|
|
if (!kdb_grepping_flag || suspend_grep) {
|
|
/* normally, every vsnprintf starts a new buffer */
|
|
next_avail = kdb_buffer;
|
|
size_avail = sizeof(kdb_buffer);
|
|
}
|
|
vsnprintf(next_avail, size_avail, fmt, ap);
|
|
|
|
/*
|
|
* If kdb_parse() found that the command was cmd xxx | grep yyy
|
|
* then kdb_grepping_flag is set, and kdb_grep_string contains yyy
|
|
*
|
|
* Accumulate the print data up to a newline before searching it.
|
|
* (vsnprintf does null-terminate the string that it generates)
|
|
*/
|
|
|
|
/* skip the search if prints are temporarily unconditional */
|
|
if (!suspend_grep && kdb_grepping_flag) {
|
|
cp = strchr(kdb_buffer, '\n');
|
|
if (!cp) {
|
|
/*
|
|
* Special cases that don't end with newlines
|
|
* but should be written without one:
|
|
* The "[nn]kdb> " prompt should
|
|
* appear at the front of the buffer.
|
|
*
|
|
* The "[nn]more " prompt should also be
|
|
* (MOREPROMPT -> moreprompt)
|
|
* written * but we print that ourselves,
|
|
* we set the suspend_grep flag to make
|
|
* it unconditional.
|
|
*
|
|
*/
|
|
if (next_avail == kdb_buffer) {
|
|
/*
|
|
* these should occur after a newline,
|
|
* so they will be at the front of the
|
|
* buffer
|
|
*/
|
|
cp2 = kdb_buffer;
|
|
len = strlen(kdb_prompt_str);
|
|
if (!strncmp(cp2, kdb_prompt_str, len)) {
|
|
/*
|
|
* We're about to start a new
|
|
* command, so we can go back
|
|
* to normal mode.
|
|
*/
|
|
kdb_grepping_flag = 0;
|
|
goto kdb_printit;
|
|
}
|
|
}
|
|
/* no newline; don't search/write the buffer
|
|
until one is there */
|
|
len = strlen(kdb_buffer);
|
|
next_avail = kdb_buffer + len;
|
|
size_avail = sizeof(kdb_buffer) - len;
|
|
goto kdb_print_out;
|
|
}
|
|
|
|
/*
|
|
* The newline is present; print through it or discard
|
|
* it, depending on the results of the search.
|
|
*/
|
|
cp++; /* to byte after the newline */
|
|
replaced_byte = *cp; /* remember what/where it was */
|
|
cphold = cp;
|
|
*cp = '\0'; /* end the string for our search */
|
|
|
|
/*
|
|
* We now have a newline at the end of the string
|
|
* Only continue with this output if it contains the
|
|
* search string.
|
|
*/
|
|
fnd = kdb_search_string(kdb_buffer, kdb_grep_string);
|
|
if (!fnd) {
|
|
/*
|
|
* At this point the complete line at the start
|
|
* of kdb_buffer can be discarded, as it does
|
|
* not contain what the user is looking for.
|
|
* Shift the buffer left.
|
|
*/
|
|
*cphold = replaced_byte;
|
|
strcpy(kdb_buffer, cphold);
|
|
len = strlen(kdb_buffer);
|
|
next_avail = kdb_buffer + len;
|
|
size_avail = sizeof(kdb_buffer) - len;
|
|
goto kdb_print_out;
|
|
}
|
|
/*
|
|
* at this point the string is a full line and
|
|
* should be printed, up to the null.
|
|
*/
|
|
}
|
|
kdb_printit:
|
|
|
|
/*
|
|
* Write to all consoles.
|
|
*/
|
|
retlen = strlen(kdb_buffer);
|
|
if (!dbg_kdb_mode && kgdb_connected) {
|
|
gdbstub_msg_write(kdb_buffer, retlen);
|
|
} else {
|
|
if (!dbg_io_ops->is_console) {
|
|
len = strlen(kdb_buffer);
|
|
cp = kdb_buffer;
|
|
while (len--) {
|
|
dbg_io_ops->write_char(*cp);
|
|
cp++;
|
|
}
|
|
}
|
|
while (c) {
|
|
c->write(c, kdb_buffer, retlen);
|
|
touch_nmi_watchdog();
|
|
c = c->next;
|
|
}
|
|
}
|
|
if (logging) {
|
|
saved_loglevel = console_loglevel;
|
|
console_loglevel = 0;
|
|
printk(KERN_INFO "%s", kdb_buffer);
|
|
}
|
|
|
|
if (KDB_STATE(PAGER) && strchr(kdb_buffer, '\n'))
|
|
kdb_nextline++;
|
|
|
|
/* check for having reached the LINES number of printed lines */
|
|
if (kdb_nextline == linecount) {
|
|
char buf1[16] = "";
|
|
#if defined(CONFIG_SMP)
|
|
char buf2[32];
|
|
#endif
|
|
|
|
/* Watch out for recursion here. Any routine that calls
|
|
* kdb_printf will come back through here. And kdb_read
|
|
* uses kdb_printf to echo on serial consoles ...
|
|
*/
|
|
kdb_nextline = 1; /* In case of recursion */
|
|
|
|
/*
|
|
* Pause until cr.
|
|
*/
|
|
moreprompt = kdbgetenv("MOREPROMPT");
|
|
if (moreprompt == NULL)
|
|
moreprompt = "more> ";
|
|
|
|
#if defined(CONFIG_SMP)
|
|
if (strchr(moreprompt, '%')) {
|
|
sprintf(buf2, moreprompt, get_cpu());
|
|
put_cpu();
|
|
moreprompt = buf2;
|
|
}
|
|
#endif
|
|
|
|
kdb_input_flush();
|
|
c = console_drivers;
|
|
|
|
if (!dbg_io_ops->is_console) {
|
|
len = strlen(moreprompt);
|
|
cp = moreprompt;
|
|
while (len--) {
|
|
dbg_io_ops->write_char(*cp);
|
|
cp++;
|
|
}
|
|
}
|
|
while (c) {
|
|
c->write(c, moreprompt, strlen(moreprompt));
|
|
touch_nmi_watchdog();
|
|
c = c->next;
|
|
}
|
|
|
|
if (logging)
|
|
printk("%s", moreprompt);
|
|
|
|
kdb_read(buf1, 2); /* '2' indicates to return
|
|
* immediately after getting one key. */
|
|
kdb_nextline = 1; /* Really set output line 1 */
|
|
|
|
/* empty and reset the buffer: */
|
|
kdb_buffer[0] = '\0';
|
|
next_avail = kdb_buffer;
|
|
size_avail = sizeof(kdb_buffer);
|
|
if ((buf1[0] == 'q') || (buf1[0] == 'Q')) {
|
|
/* user hit q or Q */
|
|
KDB_FLAG_SET(CMD_INTERRUPT); /* command interrupted */
|
|
KDB_STATE_CLEAR(PAGER);
|
|
/* end of command output; back to normal mode */
|
|
kdb_grepping_flag = 0;
|
|
kdb_printf("\n");
|
|
} else if (buf1[0] == ' ') {
|
|
kdb_printf("\n");
|
|
suspend_grep = 1; /* for this recursion */
|
|
} else if (buf1[0] == '\n') {
|
|
kdb_nextline = linecount - 1;
|
|
kdb_printf("\r");
|
|
suspend_grep = 1; /* for this recursion */
|
|
} else if (buf1[0] && buf1[0] != '\n') {
|
|
/* user hit something other than enter */
|
|
suspend_grep = 1; /* for this recursion */
|
|
kdb_printf("\nOnly 'q' or 'Q' are processed at more "
|
|
"prompt, input ignored\n");
|
|
} else if (kdb_grepping_flag) {
|
|
/* user hit enter */
|
|
suspend_grep = 1; /* for this recursion */
|
|
kdb_printf("\n");
|
|
}
|
|
kdb_input_flush();
|
|
}
|
|
|
|
/*
|
|
* For grep searches, shift the printed string left.
|
|
* replaced_byte contains the character that was overwritten with
|
|
* the terminating null, and cphold points to the null.
|
|
* Then adjust the notion of available space in the buffer.
|
|
*/
|
|
if (kdb_grepping_flag && !suspend_grep) {
|
|
*cphold = replaced_byte;
|
|
strcpy(kdb_buffer, cphold);
|
|
len = strlen(kdb_buffer);
|
|
next_avail = kdb_buffer + len;
|
|
size_avail = sizeof(kdb_buffer) - len;
|
|
}
|
|
|
|
kdb_print_out:
|
|
suspend_grep = 0; /* end of what may have been a recursive call */
|
|
if (logging)
|
|
console_loglevel = saved_loglevel;
|
|
if (KDB_STATE(PRINTF_LOCK) && got_printf_lock) {
|
|
got_printf_lock = 0;
|
|
spin_unlock_irqrestore(&kdb_printf_lock, flags);
|
|
KDB_STATE_CLEAR(PRINTF_LOCK);
|
|
atomic_dec(&kdb_event);
|
|
} else {
|
|
__release(kdb_printf_lock);
|
|
}
|
|
kdb_trap_printk = saved_trap_printk;
|
|
preempt_enable();
|
|
return retlen;
|
|
}
|
|
|
|
int kdb_printf(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int r;
|
|
|
|
va_start(ap, fmt);
|
|
r = vkdb_printf(fmt, ap);
|
|
va_end(ap);
|
|
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kdb_printf);
|